Excavating
Patent
1993-12-29
1996-03-05
Envall, Jr., Roy N.
Excavating
375341, G06F 1110, H03M 1312
Patent
active
054973848
ABSTRACT:
Maximum likelihood detection of a trellis code using a Viterbi detector constructed from a time-varying trellis structure that is associated with a partial response channel and consists of connected trellises with periodically repeated patterns of nodes and subtrellises of said trellises. Each subtrellis has nodes representing a current state of the channel and value of a predetermined tracked attribute. A survivor metric and a survivor sequence from a node at the end of one subtrellis are reassigned to a node at the beginning of an adjacent subtrellis having a different value of the tracked attribute for increasing minimum distance properties, reducing error event length and improving code constraints for timing and gain control. The one subtrellis and adjacent subtrellis may be within a single trellis or in adjacent trellises.
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Fredrickson Lisa
Karabed Razmik
Siegel Paul H.
Thapar Hemant K.
Envall Jr. Roy N.
International Business Machines - Corporation
Moise Emmanuel L.
Otto, Jr. Henry E.
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